Non-conducting compound.



UNITED s'TArEs PATENT OFFICE.

FRANC J. JEWETT, OF NEW YORK, N. Y., ASSIGNOR TO H. W. JOHNS-MANVILLE COMPANY, A

CORPORATION OF NEW YORK.

NON-GONDUCTIN COMPOULID Specification of Letters Patent.

Application filed May 8, 1906. Serial No. 315,829.

Patented June 1, 1909.

To all whom it may concern:

Be 'it known that I, FRANC'J. JEWETT, a

- citizen of the United States of America, and a resident-of the borough of Brooklyn, city of New York, county of Kings, and State of New York, have invented certain new and useful Improvements in Non- Conducting Compounds, of which the following is a specification.

My invention relates to non-heat conduct ing compounds and has forits principal object the production of a loose filler for use in preventing radiation to and conduction of heat to and from steam pipes and the like when laid in trenches or conduits.

. To this end it comprises a mechanical mixture of loose short fibered asbestos, disintegrated or shredded sponge fiber, granulated cork and infuso'rial earth. WVhile these constituents may be used in varying proportions. I find a mixture containing about 40 per cent. of asbestos fiber, per cent. of sponge, 15 per cent. of cork, and 15 A per cent. of infusorial .earth to give good results.

Thecork gives lightness and-bulk to the compound and resistance to compression or packing action, either of pressure or moisture, which packing action of course would lower the heat insulating properties of the mixture, and might leave a portion of the pipes exposed. Preferably the cork should be first treated with a compound of boron such as borax orboracic acid in order to render it fireproof.

The mixture is made up, and handled in bulk and deposited in the trench, conduit or casing inclosing the pipe in suflicient quantity to fill same andcover the pipe on all sides.

[ lVhile I have mentioned particularly thel covering of pipes as the preferred use of all other heating, insulating an ducting purposes.

I am aware that the various elements in my compound have individually'been suggested asthe constituents of non-heat conducting compounds, but I believe that I am the first to combine them all and thereb HOD-COD.-

fiber, 'ranulated cork, disintegrated sponge, and infusorial earth in substantially the proportions specified, the cork being treated i with boracic acid.

Signed at New York this 1st day of May FRANC J. J EVVETT.

Witnesses: V

J. P. 'VVmDEcnEn, E. D. PAKENHAM.

my invention, of course it is ap licable to" heat insulation comprising short asbestos. 

